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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7ac360d6ef203faecf15e5ff816b277e0b9b14435178ac52faafd42825e069f' 
  AND token = '/9lGoxDJFBLe1NuiD6ME1y0cwlyk200hHvzwNsV44r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}